Quick note: colors used so far on this portrait are White (as always), Naples Yellow, Cadmium Yellow Medium...Hue?(Could that be why it's so transparent?), Ultramarine Blue (only 'cause I couldn't find my Cerulean Blue), Chrome Oxide Green, Black (in rediculously small amounts), Raw Sienna, Burnt Sienna, Cobalt Violet.Of course, you could do everything with Grumbacher Red, Ultramarine Blue, and Cadmium Yellow Light and White. The colors I used are convenience colors. It's easier to know Cadmium Yellow Light and/ or Alizarin Crimson with Naples Yellow and White can be conveniently used to approximate the hues you might be looking for. In shadow you might cool it with a green or blue, or a Cobalt Violet that already has a blue component to it, and that you already discovered worked well with that Cadmium Yellow, for example, again demonstrating the convenience a palett evolved through your own experiences can impart.